Freedman, R., Engels, F., & Marx, K. (1968). Marxist social thought. Harcourt, Brace & World.
芝加哥风格引文Freedman, Robert,ed, Friedrich Engels, 与 Karl Marx. Marxist Social Thought. New York: Harcourt, Brace & World, 1968.
MLA引文Freedman, Robert,ed, et al. Marxist Social Thought. Harcourt, Brace & World, 1968.
警告：这些引文格式不一定是100％准确.